start unknown
Mia had some stickers. Her friend gave her 18 more stickers. Now Mia has 42 stickers. How many stickers did Mia have at the start?
24
Noah had 46 crayons. He gave some crayons to his sister. Now Noah has 28 crayons left. How many crayons did he give away?
18
A pet store had 72 fish swimming in the tanks. The store sold 34 fish to customers during the weekend. How many fish were still in the tanks?
38
When subtracting, what should I do if I do not have enough on top?
regroup
Jordan read some pages in his book on Monday. Then he read 15 more pages on Tuesday. Altogether, he read 37 pages. How many pages did Jordan read on Monday?
22
A class had 40 glue sticks. The students used some during art class. Now there are 17 glue sticks left. How many glue sticks were used?
23
Noah saved 38 dollars from doing chores around his house. His grandfather gave him 25 more dollars for helping clean the garage. How much money does Noah have now?
63
When adding, what should I do if my sum is more than 9?
Regroup
Some birds were sitting in a tree. Then 42 more birds landed in the tree. Now there are 79 birds in the tree. How many birds were there at first?
37
Mia picked 52 flowers. She gave some flowers to her grandma. Now she has 38 flowers left. How many flowers did Mia give away?
14
A baker made 56 chocolate cupcakes early in the morning for a school fundraiser. During the afternoon, customers bought 21 cupcakes. How many cupcakes were left at the end of the day?
35
How many ones are in the number 2,479
9
There were some apples in a basket. Mom added 259 more apples. Now there are 192 apples in the basket. How many apples were in the basket at first?
33
There were 264 cookies on a tray. Some cookies were eaten at lunch. Now 129 cookies remain. How many cookies were eaten?
135
There were 127 students riding on the bus for a field trip to the zoo. At the next stop, 19 more students got on the bus with their teachers. How many students are on the bus now?
146
How many tens are in the number 1,578?
7
A jar held some cookies. Dad baked 145 more cookies and put them in the jar. Now there are 344 cookies in the jar. How many cookies were in the jar before?
199
Jayden saved 375 dollars. He spent some money on a game. Now he has 248 dollars left. How much money did Jayden spend?
127
Ava had 323 balloons from her birthday party. After school, her aunt brought her 215 more balloons in many bright colors. How many balloons does Ava have now?
538
What is the vocabulary word for "breaking down" a number?
Decomposing